Cahill Keyes Megamap

by: tumagonx

Publication date: 2022-04-12

Usage: Attribution 4.0 International

Topics: world, map

My first try to make worldmap for screen.

sources:

NASA BMNG 2004 images (all months combined and downsampled)

Gene Keyes 1-degree graticule template
NASA SEDAC GPW 2020
SRTM and Blue-Earth for DEM relief
BAS Antarctica bedrock map

features:

1px:1km "M" or 1px:30arcsecond "W" enough to see bosphorus strait

Interrupted projection with compromise of equidistant, equal-area and globe-like shape

Blank apolitical map that can be used as template, no text no number!

Land topography relief with mild ocean bathymetry, the scale is exaggerated by dozens times.

Cahill-keyes "M" projection megamap and bonus "W" variant

XOR'ed 1-degree grid (visible in all area).

Magenta shade/glow show urban/metro area.

Grey area show approximation of actual antarctica land instead of ice.

Soft bathymetry that blend nicely with beach and shallow water.

Realistic look, only applied slight contrast/color/shadow/highlight correction from original BMNG.
Unlike some nasa based map, this one show maximum summer in *all* place (darken blend of all months)

This is the biggest Jpeg world Map, beyond this scale will need Tiff/Png

Tools used:

map designer, gdal, paintdotnet (with plugins), vips, MS expression design

Note about Tiff version:

They are tiled pyramid Tiff compressed with webp.

Capable viewer:

for Windows: vliv https://github.com/delhoume/vliv/releases/
for Linux: nip2 (libvips frontend)

Addeddate: 2022-04-12 17:28:54

Fail-reasons: JPEGThumb:unknown:megamap-rbga-1px1km-lq.tiffJPEGThumb:unknown:megamap-rgba-pwhq_1km.tiffJPEGThumb:unknown:megamap-rgba-pwlq_1km.tiffJPEGThumb:unknown:megamap-rgba-pwmq_1km.tiff